<template>
  <div class="login_container">
    <div class="login_box">
      <!-- 头像区域 -->
      <div class="avatar_box">
        <img src="~assets/img/login/head.jpeg" alt="">
      </div>
      <!-- 登录表单区域 -->
      <el-form ref="loginFormRef" label-width="0px" class="login_form" :model="loginForm" :rules="loginFormRules">
        <!-- 用户名 -->
        <el-form-item prop="username">
          <el-input prefix-icon="el-icon-user" v-model="loginForm.username" ></el-input>
        </el-form-item>
        <!-- 密码 -->
        <el-form-item prop='password'>
          <el-input prefix-icon="el-icon-lock" v-model="loginForm.password" type="password"></el-input>
        </el-form-item>
        <!-- 按钮区域 -->
        <el-form-item class="btns">
          <el-button type="primary" @click="login">登录</el-button>
          <el-button type="info" @click="resetLoginForm">重置</el-button>
        </el-form-item>
      </el-form>
    </div>
  </div>
</template>

<script>
export default {
  data () {
    return {
      loginForm: {
        username: "admin",
        password: "123456"
      },
      loginFormRules: {
        //验证用户名
        username: [
          { required: true, message: '请输入用户名', trigger: 'blur' },
          { min: 3, max: 10, message: '长度在 3 到 10 个字符', trigger: 'blur' }
        ],
        //验证密码
        password: [
          { required: true, message: '请输入密码', trigger: 'blur' },
          { min: 6, max: 15, message: '长度在 6 到 15 个字符', trigger: 'blur' }
        ]
      }
    }
  },
  methods: {
    //重置登录表单
    resetLoginForm() {
      this.$refs.loginFormRef.resetFields();
    },
    //表单登录验证
    login() {
      this.$refs.loginFormRef.validate(async valid => {
        if(!valid) return
        const {data: res} = await this.$http.post("login", this.loginForm)
        if(res.meta.status !== 200) return this.$message.error('登录失败！')
        this.$message.success('登录成功！')
        //将登录之后的token，保存到客户端的sessionStorage中
        window.sessionStorage.setItem("token", res.data.token);
        this.$router.push('/home')
      })
    }
  }
}
</script>

<style lang="less" scoped>
.login_container {
  background-color: #2b4d6d;
  height: 100%;
}

.login_box {
  width: 450px;
  height: 300px;
  background-color: #fff;
  border-radius: 3px;
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);

  .avatar_box {
    height: 130px;
    width: 130px;
    border: solid 1px #eee;
    border-radius: 50%;
    padding: 10px;
    box-shadow: 0 0 10px #ddd;
    position: absolute;
    left: 50%;
    transform: translate(-50%, -50%);
    background-color: #fff;
    img {
      height: 100%;
      width: 100%;
      border-radius: 50%;
    }
  }
}

.login_form {
  position: absolute;
  bottom: 0;
  width: 100%;
  padding: 0 20px;
  box-sizing: border-box;
}

.btns {
  display: flex;
  justify-content: flex-end;
}
</style>